package thread;

/**
 *  StringBuilder不是并发安全的,StringBuffered是并发安全的
 */
public class SyncDemo4 {
    public static void main(String[] args) {
 //       StringBuilder sb=new StringBuilder();
        StringBuffer sb=new StringBuffer();
        Thread t1=new Thread(){
            public void run(){
                for (int i = 0; i < 1000; i++) {
                    sb.append("abc");
                }
            }
        };
        Thread t2=new Thread(){
            public void run(){
                for (int i = 0; i < 1000; i++) {//让主线程阻塞一下,等待t1,t2线程拼接完毕
                    sb.append("def");
                }
            }
        };

        t1.start();
        t2.start();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(sb.length());
    }
}
